Is there a way to disable the "send to a friend" option in the Action list? Or if not, is it possible to get notifications when a member uses the option?

I discovered that someone had joined my forum with the sole intention of using the "send to a friend" option to send out spam emails These emails look as if they come from the forum admin and have no indication of which member actually sent them. I only know this because a recipient replied (which came to me) asking to be removed from my mailing list!!